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+#!/bin/sh
+# Test 'date --debug' option.
+
+# Copyright (C) 2016-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ date
+
+export LC_ALL=C
+
+## Ensure timezones are supported.
+## (NOTE: America/Belize timezone does not change on DST)
+test "$(TZ=America/Belize date +%z)" = '-0600' \
+ || skip_ 'Timezones database not found'
+
+
+##
+## Test 1: complex date string
+##
+in1='TZ="Asia/Tokyo" Sun, 90-12-11 + 3 days - 90 minutes'
+
+cat<<EOF>exp1
+date: parsed day part: Sun (day ordinal=0 number=0)
+date: parsed date part: (Y-M-D) 0090-12-11
+date: parsed relative part: +3 day(s)
+date: parsed relative part: +3 day(s) -90 minutes
+date: input timezone: TZ="Asia/Tokyo" in date string
+date: warning: adjusting year value 90 to 1990
+date: warning: using midnight as starting time: 00:00:00
+date: warning: day (Sun) ignored when explicit dates are given
+date: starting date/time: '(Y-M-D) 1990-12-11 00:00:00'
+date: warning: when adding relative days, it is recommended to specify noon
+date: after date adjustment (+0 years, +0 months, +3 days),
+date: new date/time = '(Y-M-D) 1990-12-14 00:00:00'
+date: '(Y-M-D) 1990-12-14 00:00:00' = 661100400 epoch-seconds
+date: after time adjustment (+0 hours, -90 minutes, +0 seconds, +0 ns),
+date: new time = 661095000 epoch-seconds
+date: timezone: TZ="Asia/Tokyo" environment value
+date: final: 661095000.000000000 (epoch-seconds)
+date: final: (Y-M-D) 1990-12-13 13:30:00 (UTC)
+date: final: (Y-M-D) 1990-12-13 22:30:00 (UTC+09)
+Thu Dec 13 07:30:00 -0600 1990
+EOF
+
+TZ=America/Belize date --debug -d "$in1" +'%a %b %e %T %z %Y' >out1 2>&1 ||
+ fail=1
+
+compare exp1 out1 || fail=1
+
+##
+## Test 2: Invalid date from Coreutils' FAQ
+## (with explicit timezone added)
+in2='TZ="America/Edmonton" 2006-04-02 02:30:00'
+cat<<EOF>exp2
+date: parsed date part: (Y-M-D) 2006-04-02
+date: parsed time part: 02:30:00
+date: input timezone: TZ="America/Edmonton" in date string
+date: using specified time as starting value: '02:30:00'
+date: error: invalid date/time value:
+date: user provided time: '(Y-M-D) 2006-04-02 02:30:00'
+date: normalized time: '(Y-M-D) 2006-04-02 XX:XX:XX'
+date: --
+date: possible reasons:
+date: non-existing due to daylight-saving time;
+date: numeric values overflow;
+date: missing timezone
+date: invalid date 'TZ="America/Edmonton" 2006-04-02 02:30:00'
+EOF
+
+# date should return 1 (error) for invalid date
+returns_ 1 date --debug -d "$in2" >out2-t 2>&1 || fail=1
+
+# The output line of "normalized time" can differ between systems
+# (e.g. glibc vs musl) and should not be checked.
+# See: https://lists.gnu.org/archive/html/coreutils/2019-05/msg00039.html
+sed '/normalized time:/s/ [0-9][0-9]:[0-9][0-9]:[0-9][0-9]/ XX:XX:XX/' \
+ out2-t > out2 || framework_failure_
+
+compare exp2 out2 || fail=1
+
+##
+## Test 3: timespec (input always UTC, output is TZ-dependent)
+##
+in3='@1'
+cat<<EOF>exp3
+date: parsed number of seconds part: number of seconds: 1
+date: input timezone: '@timespec' - always UTC
+date: timezone: TZ="America/Lima" environment value
+date: final: 1.000000000 (epoch-seconds)
+date: final: (Y-M-D) 1970-01-01 00:00:01 (UTC)
+date: final: (Y-M-D) 1969-12-31 19:00:01 (UTC-05)
+Wed Dec 31 19:00:01 -0500 1969
+EOF
+
+TZ=America/Lima date --debug -d "$in3" +'%a %b %e %T %z %Y' >out3 2>&1 || fail=1
+compare exp3 out3 || fail=1
+
+##
+## Parsing a lone number.
+## Fixed in gnulib v0.1-1099-gf2d4b5c
+## https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=f2d4b5caa
+cat<<EOF>exp4
+date: parsed number part: (Y-M-D) 2013-01-01
+date: input timezone: TZ="UTC0" environment value or -u
+date: warning: using midnight as starting time: 00:00:00
+date: starting date/time: '(Y-M-D) 2013-01-01 00:00:00'
+date: '(Y-M-D) 2013-01-01 00:00:00' = 1356998400 epoch-seconds
+date: timezone: Universal Time
+date: final: 1356998400.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2013-01-01 00:00:00 (UTC)
+date: final: (Y-M-D) 2013-01-01 00:00:00 (UTC+00)
+Tue Jan 1 00:00:00 UTC 2013
+EOF
+
+date -u --debug -d '20130101' >out4 2>&1 || fail=1
+compare exp4 out4 || fail=1
+
+
+##
+## Parsing a relative number after a timezone string
+## Fixed in gnulib v0.1-1100-g5c438e8
+## https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5c438e8ce7d
+cat<<EOF>exp5
+date: parsed date part: (Y-M-D) 2013-10-30
+date: parsed time part: 00:00:00
+date: parsed relative part: -8 day(s)
+date: parsed zone part: UTC+00
+date: input timezone: parsed date/time string (+00)
+date: using specified time as starting value: '00:00:00'
+date: starting date/time: '(Y-M-D) 2013-10-30 00:00:00 TZ=+00'
+date: warning: when adding relative days, it is recommended to specify noon
+date: after date adjustment (+0 years, +0 months, -8 days),
+date: new date/time = '(Y-M-D) 2013-10-22 00:00:00 TZ=+00'
+date: '(Y-M-D) 2013-10-22 00:00:00 TZ=+00' = 1382400000 epoch-seconds
+date: timezone: Universal Time
+date: final: 1382400000.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2013-10-22 00:00:00 (UTC)
+date: final: (Y-M-D) 2013-10-22 00:00:00 (UTC+00)
+2013-10-22
+EOF
+
+in5='2013-10-30 00:00:00 UTC -8 days'
+date -u --debug +%F -d "$in5" >out5 2>&1 || fail=1
+compare exp5 out5 || fail=1
+
+##
+## Explicitly warn about unexpected day/month shifts.
+## added in gnulib v0.1-1101-gf14eff1
+## https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=f14eff1b3cde2b
+TOOLONG='it is recommended to specify the 15th of the months'
+cat<<EOF>exp6
+date: parsed date part: (Y-M-D) 2016-10-31
+date: parsed relative part: -1 month(s)
+date: input timezone: TZ="UTC0" environment value or -u
+date: warning: using midnight as starting time: 00:00:00
+date: starting date/time: '(Y-M-D) 2016-10-31 00:00:00'
+date: warning: when adding relative months/years, $TOOLONG
+date: after date adjustment (+0 years, -1 months, +0 days),
+date: new date/time = '(Y-M-D) 2016-10-01 00:00:00'
+date: warning: month/year adjustment resulted in shifted dates:
+date: adjusted Y M D: 2016 09 31
+date: normalized Y M D: 2016 10 01
+date: '(Y-M-D) 2016-10-01 00:00:00' = 1475280000 epoch-seconds
+date: timezone: Universal Time
+date: final: 1475280000.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2016-10-01 00:00:00 (UTC)
+date: final: (Y-M-D) 2016-10-01 00:00:00 (UTC+00)
+Sat Oct 1 00:00:00 UTC 2016
+EOF
+
+date -u --debug -d '2016-10-31 - 1 month' >out6 2>&1 || fail=1
+compare exp6 out6 || fail=1
+
+
+##
+## Explicitly warn about crossing DST boundaries.
+## added in gnulib v0.1-1102-g30a55dd
+## https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=30a55dd72dad2
+TOOLONG2='it is recommended to specify the 15th of the months'
+cat<<EOF>exp7
+date: parsed date part: (Y-M-D) 2016-06-01
+date: parsed local_zone part: isdst=1
+date: parsed relative part: +6 month(s)
+date: input timezone: TZ="America/New_York" environment value, dst
+date: warning: using midnight as starting time: 00:00:00
+date: starting date/time: '(Y-M-D) 2016-06-01 00:00:00'
+date: warning: when adding relative months/years, $TOOLONG2
+date: after date adjustment (+0 years, +6 months, +0 days),
+date: new date/time = '(Y-M-D) 2016-11-30 23:00:00'
+date: warning: daylight saving time changed after date adjustment
+date: warning: month/year adjustment resulted in shifted dates:
+date: adjusted Y M D: 2016 12 01
+date: normalized Y M D: 2016 11 30
+date: '(Y-M-D) 2016-11-30 23:00:00' = 1480564800 epoch-seconds
+date: timezone: TZ="America/New_York" environment value
+date: final: 1480564800.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2016-12-01 04:00:00 (UTC)
+date: final: (Y-M-D) 2016-11-30 23:00:00 (UTC-05)
+2016-11-30
+EOF
+
+in7='2016-06-01 EDT + 6 months'
+TZ=America/New_York date --debug -d "$in7" +%F >out7 2>&1 || fail=1
+compare exp7 out7 || fail=1
+
+
+## fix local timezone debug messages.
+## fixed in git v0.1-1103-gc56e7fb
+## https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=c56e7fbb032
+
+cat<<EOF>exp8_1
+date: parsed date part: (Y-M-D) 2011-12-11
+date: parsed local_zone part: isdst=0
+date: input timezone: TZ="Europe/Helsinki" environment value
+date: warning: using midnight as starting time: 00:00:00
+date: starting date/time: '(Y-M-D) 2011-12-11 00:00:00'
+date: '(Y-M-D) 2011-12-11 00:00:00' = 1323554400 epoch-seconds
+date: timezone: TZ="Europe/Helsinki" environment value
+date: final: 1323554400.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2011-12-10 22:00:00 (UTC)
+date: final: (Y-M-D) 2011-12-11 00:00:00 (UTC+02)
+Sun Dec 11 00:00:00 EET 2011
+EOF
+
+TZ=Europe/Helsinki date --debug -d '2011-12-11 EET' >out8_1 2>&1 || fail=1
+compare exp8_1 out8_1 || fail=1
+
+cat<<EOF>exp8_2
+date: parsed date part: (Y-M-D) 2011-06-11
+date: parsed local_zone part: isdst=1
+date: input timezone: TZ="Europe/Helsinki" environment value, dst
+date: warning: using midnight as starting time: 00:00:00
+date: starting date/time: '(Y-M-D) 2011-06-11 00:00:00'
+date: '(Y-M-D) 2011-06-11 00:00:00' = 1307739600 epoch-seconds
+date: timezone: TZ="Europe/Helsinki" environment value
+date: final: 1307739600.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2011-06-10 21:00:00 (UTC)
+date: final: (Y-M-D) 2011-06-11 00:00:00 (UTC+03)
+Sat Jun 11 00:00:00 EEST 2011
+EOF
+
+TZ=Europe/Helsinki date --debug -d '2011-06-11 EEST' >out8_2 2>&1 || fail=1
+compare exp8_2 out8_2 || fail=1
+
+
+
+## fix debug message on lone year number (The "2011" part).
+## fixed in gnulib v0.1-1104-g15b8f30
+## https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=15b8f3046a25
+##
+## NOTE:
+## When the date 'Apr 11' is parsed, the year part will be the
+## current year. The expected output thus depends on the year
+## the test is being run. We'll use sed to change it to XXXX.
+cat<<EOF>exp9
+date: parsed date part: (Y-M-D) XXXX-04-11
+date: parsed time part: 22:59:00
+date: parsed number part: year: 2011
+date: input timezone: TZ="UTC0" environment value or -u
+date: using specified time as starting value: '22:59:00'
+date: starting date/time: '(Y-M-D) 2011-04-11 22:59:00'
+date: '(Y-M-D) 2011-04-11 22:59:00' = 1302562740 epoch-seconds
+date: timezone: Universal Time
+date: final: 1302562740.000000000 (epoch-seconds)
+date: final: (Y-M-D) 2011-04-11 22:59:00 (UTC)
+date: final: (Y-M-D) 2011-04-11 22:59:00 (UTC+00)
+Mon Apr 11 22:59:00 UTC 2011
+EOF
+
+date -u --debug -d 'Apr 11 22:59:00 2011' >out9_t 2>&1 || fail=1
+sed '1s/(Y-M-D) [0-9][0-9][0-9][0-9]-/(Y-M-D) XXXX-/' out9_t > out9 \
+ || framework_failure_
+compare exp9 out9 || fail=1
+
+
+Exit $fail